Iran, the world’s top terror sponsor, denounced President Donald Trump’s travel ban on six Muslim-majority countries Friday, calling it a “shameful exhibition.”

“US now bans Iranian grandmothers from seeing their grandchildren, in a truly shameful exhibition of blind hostility to all Iranians,” said Foreign Minister Javad Zarif in a Twitter post Friday.

Trump’s travel ban went into partial effect on Friday after a long fight in the courts. The issue was taken to the Supreme Court, which stayed lower court rulings preventing enforcement of the measure on Monday. The new measure will require those traveling from Iran, Libya, Somalia, Sudan, Syria and Yemen to prove a “bona fide relationship with a person or entity in the United States.”